We all have them. That person who makes you dread looking at Facebook. Their posts make you cringe for any number of reasons and you ask yourself how a person that you like in real life can be such a doofus on line.

I'm not going to lie to you - if you took typing classes in school, didn't have a cell phone as a kid, or remember when McDonald's had a smoking section...this article is probably mostly directed at you because you are probably making these mistakes on LinkedIn.